Maybe. Point is, people posted their homework online, allowing others - also during the same year - to just copy the work. They could do that offline too, but either way it's just not cool. The students in question should probably be reprimanded as well if they were told it wasn't permitted to post the solutions online. We have an assessment as part of our hiring process, there too it's not permitted by applicants to make their solutions public - and making a new assignment would cost us a lot of money in terms of lost billable hours, especially if it would have to be done for every applicant.